This is the one theory that i have always believed 100 percent. Think about it, Walt always called John Locke "Mr. Locke" the only other person that i can think of who calls him that is.....Matthew Abaddon. Now that we know that time travel is possible, it is quite possible that older Walt starts calling himself Matthew Abaddon, travels back in time so he can put Locke on the right path to the island.

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